Rod of smoking material and cigarettes made therefrom

Abstract

A rod of smoking material having an inner wrapper of sidestream reducing paper containing carbon as part of its total filler content and an outer overwrapping cigarette paper.

We claim: 
     
       1. A rod of smoking material having an inner wrapper of sidestream reducing paper and an outer overwrapping cigarette paper, said sidestream reducing paper having a basis weight in the range of 35 g/m 2  to 50 g/m 2 , a porosity of between 5 and 20 coresta units, and has a filter content which includes 8% to 15% carbon, 6% to 11% magnesium hydroxide (Mg(OH) 2 ) and 15% to 20% calcium carbonate (CaCO 3 ). 
     
     
       2. A rod of smoking material as claimed in claim 1 in which the outer wrapping is a conventional cigarette paper or a low sidestream cigarette paper. 
     
     
       3. A rod of smoking material as claimed in claim 2 in which the inner wrapper and outer wrapping are of different porosity. 
     
     
       4. A rod smoking material as claimed in claim 1 in which the outer overwrapping is impregnated with or incorporates a flavour component. 
     
     
       5. A rod of smoking material as claimed in claim 1 in which the carbon portion of the filler is impregnated with a flavour component. 
     
     
       6. A rod of smoking material as claimed in claim 1 in which the filler material incorporates a flavour component. 
     
     
       7. A rod of smoking material as claimed in claim 1 in which an irritant reducing compound is added to the filler. 
     
     
       8. A rod of smoking material as claimed in claim 1 in which an impact enhancing compound is added to the filler. 
     
     
       9. A rod of smoking material as claimed in claim 1 in which the surface area of the carbon used in the filler is in the range of 200 to 2000 m 2  g -1  with activities (measured by the Carbon Tetrachloride method of absorption) in the range of 20% to 150%. 
     
     
       10. A rod of smoking material as claimed in claim 1 which is attached to a filter element. 
     
     
       11. A rod of smoking material having an inner wrapper of sidestream reducing paper and an outer overwrapping cigarette paper, said outer overwrapping cigarette paper being low sidestream cigarette paper, said sidestream reducing paper of said inner wrapper having a basis weight in the range of 35 g/m 2  to 50 g/m 2 , a porosity of between 5 and 20 coresta units, and has a filter content which includes 8% to 15% carbon, 6% to 11% magnesium hydroxide (Mg(OH) 2 ) and 15% to 20% calcium carbonate (CaCO 3 ).